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More than 800 members of the Colombian army have been jailed so far in the "false positive" scandal.
Civilians were murdered and their bodies passed off as those of rebels or paramilitaries to boost the army's combat kill rate.
Colombia's attorney general is investigating thousands more cases.
All of them are alleged to have happened between 2002 and 2008, when the scandal broke.
In a report published on Wednesday, Human Rights Watch (HRW) said that it had seen evidence strongly suggesting that "numerous generals and colonels knew or should have known about 'false positive' killings, and may have ordered or otherwise actively furthered them".
Most of the soldiers convicted so far in connection with the scandal are of low rank, although some did command units or even battalions.
The rights group said that it had reviewed transcripts or recordings of testimony provided to prosecutors directly accusing several of Colombia's highest ranking officers of "having known of, planned, or attempted to facilitate false positive killings while holding those positions".
Among those named in the report as those who knew or should have known of the crimes are the former head of the Joint Caribbean Command, retired Gen Gonzalez Pena and the former army commander, retired Gen Mario Montoya.
One of the brigades implicated by the evidence is the 15th Mobile Brigade.
According to the report, the brigade is under investigation for 38 extrajudicial killings allegedly committed between 2006 and 2008.
Sgt Carlos Eduardo Mora was a member of the 15th Mobile Brigade and has been a key witness.
In 2007, he was working for the unit's intelligence division. He told the BBC that when he noticed suspicious activities he tried to alert some of his superiors.
He said that his superiors warned him that his family would be killed if he told anyone about what he knew.
Despite the threat, Sgt Mora reported his suspicions to the attorney general's office at the end of 2008.
The evidence he provided led to the conviction of a number of members of his former brigade.
Its former chief of operations, Jesus Rincon Amado, was sentenced to 35 years in jail for a murder committed in 2007.
Col Santiago Herrera Fajardo, who commanded the brigade, is currently on trial.
Prosecutors are also investigating members of the 4th Brigade for at least 44 alleged extrajudicial killings carried out between 2001 and 2003.
During that time, the battalion was under the command of Gen Mario Montoya, who was later promoted to lead the Colombian Army.
Earlier this week, the attorney general's office announced that it had summoned the now retired Gen Montoya and three other generals to give evidence in July.
According to the HRW report, the battalions which were led at the time by the current commanders of the Colombian army, Gen Jaime Lasprilla, and of the armed forces, Gen Juan Pablo Rodriguez, are also among those being investigated.
Colombia's President Juan Manuel Santos defended the two officers.
He said that both men had shown him documents which demonstrate that "there is not one single investigation against" them.
President Santos said that although wrongdoing should be punished, that the army should not be "tarnished".
HRW says the investigations have been hampered by threats and attacks on key witnesses.
A ministry of defence official told the BBC that they were "providing every possible protection" to the witnesses.
Lt Col Carlos Javier Soler Parra said that the government had put a protection scheme in place for members of the armed forces who have acted as witnesses.
But Sgt Mora has said that he fears for his life.
In its report, HRW also quotes prosecutors as saying that members of the armed forces "placed obstacles in the way of obtaining files crucial to their investigations".
In a statement, the army denied this, arguing that it had put teams in place specifically tasked with providing the required information to investigators.
"We are the first ones interested in clarifying the facts," it said.
Regardless of the obstacles, the attorney general's office is currently investigating at least 3,700 extrajudicial killings that took place within more than 180 battalions and other tactical units, according to HRW.
Human Rights Watch has said that it has seen evidence suggesting high-ranking army officers in Colombia knew of the extrajudicial killings of civilians.

It follows reports the Democratic Unionist Party wants £2bn extra funding from a Tory-DUP deal at Westminster.
Mr Jones described such a deal, to give Theresa May a majority in key Commons votes, as the "great power bribe".
Responding, Welsh Secretary Alun Cairns said UK ministers had a "pretty strong record" on funding for Wales.
After the Conservatives' failure to win a majority in the general election, they have been locked in talks with the DUP for support to help them survive as a minority government.
Sources told the BBC on Wednesday the DUP wanted £1bn investment in the Northern Irish health service and a similar figure for infrastructure projects, although a DUP MP called those figures "wide of the mark".
Mr Jones said: "Ah, the great power bribe.
"What we're seeing there is an attempt to provide more money for Northern Ireland and, if I were the DUP, I'd do the same thing.
"But the reality is you can't give more money to Northern Ireland and not trigger the Barnett formula, which would mean more money for Wales and Scotland."
The Barnett formula is a long-running mathematical calculation that distributes money to Wales, Scotland and Northern Ireland.
Mr Jones added: "I think every underhand way will be found to give more money to Northern Ireland at the expense of Scotland, Wales and indeed the English regions."
Welsh Conservative leader Andrew RT Davies has said "any potential incentives considered for one nation... must also be considered for Wales".
But Prof Gerry Holtham, an economist and former adviser to the Welsh Government, said the Barnett formula "works in one direction only" - to ensure spending changes in England are reflected in Wales, Scotland and Northern Ireland - and was "just a convention".
"If the government decides it's going to do a formula bypass, which it's done on many past occasions, that's what it does," he said.
"They will do what they can get away with, basically. If the pressure for fairness is politically significant then they might make some concessions but they really don't need to."
The DUP is also reported to be calling on the Treasury to scrap Air Passenger Duty (APD) in Northern Ireland.
Such powers have already been transferred to Scotland.
Mr Jones, whose Welsh Government owns Cardiff Airport, said: "It's completely irrational that Scotland and Northern Ireland would control Air Passenger Duty, as would England, but Wales wouldn't."
Mr Cairns said the current funding settlement for Northern Ireland was "very different" from that for Wales.
"Wales has £120 for every £100 that's spent in England, Wales has a funding floor that Northern Ireland doesn't have," he said.
"And Wales also has City Deals for the Cardiff Capital Region and the Swansea Bay City Region as well as a commitment to the North Wales Growth Deal - there isn't a City Deal in Northern Ireland.
"So that demonstrates we've got a pretty strong record and I hope that is recognised."
Pontypridd MP and Labour's Northern Ireland spokesman Owen Smith said any Tory-DUP deal had to be scrutinised.
But Westminster politics "can't inhibit getting the peace process up and running" in Northern Ireland, he said.
Speaking on BBC Wales' The Wales Report, he said: "Talking about parity between the sorts of treatment that Northern Ireland gets and other parts of the UK isn't what we've done in the past.
"Northern Ireland is a special case and it will always need special consideration."
Conservative UK ministers will find an "underhand way" to give Northern Ireland more money at Wales' expense, First Minister Carwyn Jones has said.

The event, at the Somme Museum near Newtownards, is open to the public and began at 19:00 BST on Thursday.
Similar vigils will be taking place in Cardiff, Edinburgh and London.
The Queen and Duke of Edinburgh are to attend a service at the grave of the Unknown Warrior in Westminster Abbey. The vigil at the Somme Museum will be held outdoors.
A guard of honour is to be present throughout the night and will include serving soldiers.
It will end with a service on Friday morning which will include the blowing of whistles at 07:28 BST - the exact time when the advance was signalled to begin one of the bloodiest battles in human history.
Nearby, a lone piper played a lament on Helen's Tower on the Clandeboye estate near Bangor on Thursday night.
Soldiers from the 36th Ulster Division trained on land around the tower before heading to battlefields of France
About 2,500 people will congregate on Friday at the Ulster Tower in Thiepval, a quiet corner of northern France.
With just hours left until the commemoration marking 100 years since the Battle of the Somme, final preparations are in full swing.
Scores of soldiers march to and from the tower and the Royal Irish Regiment band tunes up for a rehearsal.
The world's media ready themselves to capture the sights and sounds of the anniversary event.
Your Somme:  What would YOU have done 100 years ago?
Ghosts of Thiepval: Step inside the trenches, in virtual reality
Voices 16: Objects from a tumultuous year
iWonder: Irish soldiers at the Somme
Thousands of soldiers from across Ireland were killed at the Somme, 2,000 of them from the 36th Ulster Division died on the first day of the battle.
The Ulstermen who gave their lives in the World War One will also be commemorated in France, at the Ulster Memorial Tower, close to the village of Thiepval, which is a copy of Helen's Tower.
The tower, which stands 70ft (21m) in height, was built in 1921.
It was the first official memorial to be erected on the Western Front, according to the Somme Association charity, which has responsibility for maintaining the monument.
Families of soldiers who were killed in the battle have also started arriving in France ahead of the Somme centenary commemoration in Thiepval on Friday.
Brian Hewitt from Banbridge , County Down, has made the journey to pay tribute to his great, great uncle William James Allen, who fought with the 9th Battalion, the Royal Irish Fusiliers.
Pte Allen was originally from Portadown, County Armagh, but was living in America when he enlisted in the British Army.
He was killed in action on the opening day of the Somme.
Mr Hewitt plans to place a cross on the Thiepval Memorial in his honour, during the centenary commemorations.
"My father was to do it five years ago but died beforehand, before he could get over, so I'm going to fulfil a family ambition," he said.
The Foys from County Cavan flew into Paris last night.
Lucas Foy said he wanted to see the graves of the men who farmed the land close to him in County Cavan, before they lost their lives on the front line.
He said: "They (the men) didn't know what they were going to. They thought they'd be home in no time."

An overnight vigil is taking place in County Down to mark the beginning of the Battle of the Somme 100 years ago.

